Helix



FIG. 1 is a perspective view of a helix showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a right side elevation view thereof; and,

FIG. 7 is a left side view thereof.

The ornamental design for a helix, as shown and described.